Bag sewing apparatus



o. WEBER ET AL BAG SEWING APPARATUS Original Filed April 13, 1933 3 Sheets-Sheet 1 0660 Wber AZertO er I I" dzarngl.

Aug. 18, 1936. o. WEBER ET AL I 2,051,117

BAG SEWING APPARATUS Ori inal Filed April 13, ,1933 s Sheets-Sheet 2 i Er- 5 M l L 1L?! m ,T'"""T'** L 0 m L I K Inventors, .v.\ \Lklf otwfibe Albert Upper/120mm Aug. 18, 1936. o. WEBER El AL BAG SEWING APPARATUS Original Filed April 13, 1953 s Sheets-Shieet 5 6 Lvvewrons OT-rawebe Patented Aug. 18, 1936 UNITED STATES PATENT OFFlCE BAG SEWING APPARATUS zerland Original application April 13, 1933, Serial No. 666,002. Divided and this application October 31, 1933, Serial No. 696,072. In Germany February 17, 1933 7 Claims.

Our invention relates to improvements in bag sewing apparatus, and more particularly in the chain stitch sewing device in which the needle is equipped with a sliding latch for closing the notch of the needle. The object of the improvements is to provide a sewing apparatus which is simple in construction and reliable in operation, and which may be manufactured at low cost.

For the purpose of explaining the invention an example embodying the same has been shown in the accompanying drawings in which the same reference characters have been used in all the views to indicate corresponding parts. In said drawings,

Fig. 1 is an elevation showing the sewing apparatus,

Fig. 2 is an elevation on an enlarged scale showing the needle and the slide mounted thereon, the said slide being retracted from the notch,

Fig. 3 is a sectional elevation taken on the line 3--3 of Fig. 2,

Fig. 4 is an elevation similar to the one illustrated in Fig. 2 and showing the slide in projected position for closing the notch of the needle,

Fig. 5 is a plan view on an enlarged scale and partly in section, showing the device controlling the movement of the slide,

Fig. 6 is an elevation of the parts shown in Fig. 5,

.30 Fig. 7 is an elevation partly in section showing the stitch plate and the needle,

Fig. 8 is an elevation viewed from the left in Fig. '7,

Fig. 9 is a fragmentary elevation of the stitch 35 plate and the needle, showing the needle projected through the stitch plate,

Fig. 10 is an elevation viewed from the left in Fi 9.

Figs. 11 and 14 to 20 are a series of fragmenfl) tary horizontal sections showing the steps in a cycle of stitch-forming operations, and

Figs. 12 and 13 are vertical sections further illustrating the relative positions of the parts as the needle moves from the position of Fig. 11 to .45 that of Fig. 14.

Referring at first to Fig. 1, the sewing apparatus comprises an electric motor I which is mounted on a frame comprising four legs 2 carrying rollers 3 at their bottom ends, by means of which the 50 apparatus is guided on a frame composed of angle bars 4 and adapted to be placed on a filled bag. The said frame has been described in copending application for Patent Ser. No. 666,002 of which this application is a division.

.55 To the top of the casing of the motor I a handle 5 is secured which carries a hand-operated switch 6 for connecting the sewing apparatus at will to a source of current. The motor shaft is connected by means of a suitable gearing located within the casing with a shaft 1 carrying a crank 5 disk 8, the said disk 8 being rotated from the motor shaft at reduced speed.

From the crank disk 8 reciprocating movement is imparted to a needle holder I i and a needle Ill fixed thereto by means of a screw 38, the said 10 needle holder being connected with the crank disk by a link 9. The needle holder l I is secured to a bar I 3 guided near its ends in eyes l2 depending from arms [2 connected with the motor casing. 15

On the arms l2 a stitch plate l4 and a head l6 are mounted, the stitch plate l4 being provided with a hole for the passage. of the needle In therethrough, and the head It being adapted to be engaged by the point of the needle passed into the 20 same for taking the thread [5. The thread I5 is supplied to the head l6 from a spool H which is carried by a pair of arms l8 secured to the casing of the motor I, and it is trained on a guide roller I9 carried by one of the arms I2. 5

The construction of the needle is shown in Figs.

2 and 3. At its top side the said needle is formed with a longitudinal groove 20 in which an elongated slide 2| is mounted by means of which the notch 20 made in the body of the needle near the point thereof is adapted to be opened and closed. The slide is held in position in the groove by means of enlarged portions 22. The needle is formed, at its rear end, with a portion 34 of reduced diameter, which passes through a control- 35 ling member 32 and carries a transverse pin 36.

A bore of the said controlling member 32 receives the rear end of the slide 2| which is fixed in position by means of a screw 31. At its bottom end the controlling member 32 is formed with a socket 3i in which a ball 3|] and a coiled spring 29 are embedded.

To the left hand arm 12 brackets 24 and 25 are secured which are formed at-their bottom ends with bores 26 in which a bar 21 is mounted, which is fixed in position by means of screws 28, and which is formed near its ends with notches 21 and 21 adapted to be engaged by the ball 30.

The notches 21 and 2! of the bar 21 are greater in length than the diameter of the ball 30. The

; notch 21 is thus enlarged for the reason that the open needle l0 passed into the hole of the stitch plate must be held open for a short period of time after the beginning of the return movement of the needle holder in order that the thread I5 may be safely grasped thereby. As long as the ball 30 engages in the notch 21 the controlling member 32 is carried along by the needle holder without change in relative positions of the needle body and the sliding latch. The notch'2l is elongated in order that the sliding latch 2| may be safely held closed until the return movement of the needle has begun and that the needle be then safely opened, which is done only when the controlling member 32 is spaced from the needle holder so far as is determined by the position of the pin 36. At the beginning of the forward movement of the needle holder the ball 30 impinges upon the right hand end of the notch 21 thus producing a slight jar by means of which the controlling member 32 is held back.

The needle holder II is reciprocated by the crank 8, and such reciprocating movement is transmitted to the needle Ill which is fixed to the holder H by a screw 38. At the beginning of the stitching operation and when the needle moves in the direction of the arrow :0, (Figs. 5, 6, 11 and 1'7) the rear extension 34 of the needle slides in the bore 33 of the controlling member 32, until the pin 36 impinges upon the controlling member, which is thereby carried along. Now the ball 30 which acts as a yieldable detent is pushed into its socket by the median solid part of the bar 21 in opposition to the spring 3|. By the relative displacement of the needle and the controlling memin the notch 21 of the guide bar 21, which is located near the point of the needle.

Before the needle It begins its return movement from its right hand end position and in the direction of the arrow y (Figs. 5, 6, 15 and 18) the controlling member 32 is slightly spaced from the needle holder v If thereafter the needle holder II is moved at high velocity to the left, the controlling member 32 remains in the said position spaced from the needle holder l| until the ball arrives at the end of the notch 21 and rolls on the solid part of the bar 21. Now the needle holder engages the controlling member 32 and carries the same along. By this-relative displacement of the needle holder and the controlling member 32 the notch 29 of the needle I0 is closed by the slide 2| connected with the controlling member 32. Upon further return movement of the needle I!) the needle holder shifts the controlling member 32 into the left hand end position, while the notch 20 remains closed. The said notch continues to be closed until the needle holder performing its forward movement has been advanced relatively to the controlling member 32. 1

When the needle has been retracted the hole made'in the stitch plate I4 for the passage of the needle ther'ethrough is closed by means of an automatically controlled slide 42, which slide permits even heavy fabrics to be readily stitched by the needle, because the opening of the stitch plate accommodates itself to the cross-section of the needle point and thus forces the fabric of the bag along the needle. Transversely of the hole 39 made in the stitch plate M for the passage of the needle a recess is made in the stitch plate, which is rectangular cross-section and directed upwardly, and in the said recess a slide 42 has reciprocating movement.

The slide 42 is acted upon by a spring 4| embedded in the said recess. At its bottom end the slide 42 is formed with a foot 43 which bears on the needle In which has been projected through the hole of the stitch plate.

The slide 42 and the needle ID are safely guided relatively to each other in lateral direction by means of an arcuate cavity 44 made at the bot-' tom side of the foot 43, the needle I0 being inserted into the space provided between the slide 42 and the lower wall of the hole 39 and elevating the slide in its recess 49 while compressing the spring 4|. The upward movement of the slide 42 is limited by a shoulder l4 provided at the front wall of thestitch plate M. For reducing friction the said arcuate bottom face of the slide 42 may be reduced in length by relieving the said bottom face.

In Figs. '7 and 8 the slide 42 is shown in its lowermost position. The arrow 2: shown in Fig. 7 indicates themovement of the needle in in the direction towards the bag shown in Figs. '7 and 9 in broken lines. In the position of the parts shown in Fig. 7 the needle is just aboutto pass into the bore 39.

Figs. 9 and 10 show the parts in the position -in which the needle has been passed into the bore In Figs. 11 to 20 the stitch plate I4 is omitted to save room on thedrawings and also because the machine can be constructed without such a plate. The thread |5 is drawn through holes 50 and 5| in the head, as shown by the arrows in Figs. 11 to 1'7, and the machine is then ready for operation as above described, the direction of relative movement of the bag and the sewing machine between stitches being indicated by the arrows in-Figs. 1'7 and 20. a a

While in describing the invention reference has been made'to a particular example embody ing the same we wish it to be understood that .our invention'is not limited to the construction shown in the drawings, and that various changes may be made in the general arrangement of the apparatus and the construction of its partswithout departing from the invention. More particularly our invention is not limited to the construction of thesewing apparatus and the man- .ner of mounting the same on the frame.

We claim: 7 1. A bag sewing apparatus, comprising a guide frame adapted to be placed on a filled bag, a sew- Y ing apparatus movable on said frame and providpressed detent mounted on said controllingmemher, and a guide bar on which said controlling member is slidable and formed near its ends with elongated notches providing shoulders adapted ,to be engaged by said detent after the beginning respectively of the forward and return movements thereof for arresting said controlling member. y

2. A bag sewing apparatus, comprising aframe '70 adapted to be placed on the bag, and a sewing apparatus shiftable. on said frame, said sewing apparatus comprising a needle and its operating mechanism, astitch plate. having a hole for the 7 passage of the needle therethrough, and a slide movable transversely of the needle for opening and closing said hole and formed with a recess adapted to be engaged by the point of the needle for moving the slide away from said hole.

3. A bag sewing apparatus, comprising a frame adapted to be placed on the bag, and a sewing apparatus shiftable on said frame, said sewing apparatus comprising a needle and its operating mechanism, a stitch plate having a hole for the passage of the needle therethrough and formed with a socket extending from said hole transversely of the needle, a spring-pressed slide mounted in said socket and movable transversely of the needle for opening and closing said hole and formed with a bevelled recess adapted to be engaged by the point of the needle for moving the slide away from said hole.

4. A bag sewing apparatus as claimed in claim 2, in which the slide is formed at its bottom end with a bevelled rear face.

5. Sewing mechanism comprising a machine frame, a hooked needle having a slotted stem, a latch slidable in the slot of the stem, operating means for the needle connected to said stem, a block mounted on the stem of the needle in rear of said driving connection, said block having a lost motion connection to said stem and being fixed to said latch, a spring detent on the block, and a rod fixed to said frame parallel to said stem, said rod having elongated notches at its ends for receiving said detent, such notches permitting the latch to move initially with the stem and then forcing it to move relatively to the stem for opening or closing the needle.

6. Sewing mechanism comprising a machine frame, a hooked needle having a slotted stem, a latch slidable in the slot of the stem, operating means for the needle connected to said stem, a controlling member fixed to said latch and having lost motion connection with said stem, at fixed rod parallel to said stem, said rod having elongated notches therein providing shoulders on the rod, and a spring-pressed roller on said controlling member, said roller being positioned to engage one of said shoulders after the needle movement has begun, thereby causing the latch to move relatively to the stem.

'7. Sewing mechanism comprising a machine frame, a hooked needle having a slotted stem, a latch slidable in the slot of the stem, operating means for the needle connected to said stem, a controller fixed to said latch and slidably supported by said stem, means on said stem for limiting the movement of the controlling member relatively thereto, a rod parallel to said stem, shoulders on said rod, and means on said controller for engaging said shoulders after the stem has moved to a limited extent in either direction for temporarily arresting the movement of the latch with the stem.

OTTO WEBER. ALBERT OPPERMANN. 

